Boiler furnace



' Oct. v 7. 1925- 1,559,048 Y J. A. PACKARD BOILER FURNACE Filed April22. 1921 4 Sheets-Shoat 1 TOR ATTORNEY J. A'. PACKARD somsa wanes FiledApril 22. 1921 v Oct. 27,1925.

4 Shah-Shoat 2 Oct. 27, 1925 1,559,048

' J. A. PACKARD BOILER FURNACE Filed April 22 1921 4 Sheets-Sheet 5MOTOR u I I 4 n I m I G q i W E 25 1) M J W a I} m. a 5 8 J M E 5 0 I "wW 4 1 l I I I l I l l l l l l l l I l l I l I lm L m 0% Z w Z O u /5 flm m .f

AIR nsssunz I l 1 i I l 5 ciao: I l I i WITNESSES Oct. 27, 1925-1,559,048

v J. A. PACKARD BOILER FURNACE Filed April 22, 1921 Patented Oct. 27,1925.

I l r 1,559,048 PATENT OFFICE...

UNI'I'EDv STATES James. A. mm, or MILWAUKEE, wrsconsm. BeILEa rtmmicnApplieatien iiled Apri1,22 19;2 semi No. 463,441..

To all whom it may concern .1

Be it known that I, JAMES. Although; a

citizen of the United States; ancl'resident ing drawings, which are apart of this speci- 10 fication. I

The invention relates .to stokers, vmore particularly forboilers. andofthe inclined reciprocating: grate type;

v Qne-of the obje ts. of this. invention isto provide afstoker having agrate. composed of a plurality of, reciprocating grate units, adjacentunits movingfin opposite directions I with a f ed. slide carried bythose. units; moving in the same; directiongso as to. advance the fuelover the grate,jsaicl unitsibeing dist e m v ment oi hejfilelll furtherobject of the invention is to provide a reciprooating grate unit madeupof a. plurality of? removable grate sections.

A. further objeet. of. the invention is. to

provide an. agitating mechanismin the feed hopper to prevent clogg ngof. the fuel. I I I section WhlCh 11'ee,d.,renewal. ,withoHtiliavmgtherein.

' fi 'therlobject-ofthe invention isato provide impo led meanstforclumping and rush ng the ash- A. further. object; or the, mum. is, to

' provide means. for, furnishing blast. airqto gratescand. to indica ethe'pr of he he ai A/further object efthe invention] isto vide; air,conduits between, the sides of the grates. and.-t11.e outer Walls ofthefur- The invention further consists intheisev eraleatu eshereinafter. set. forth, and more par icu1ar1v efinel r ms a themolusion hereofj Inthe drawings Eigrlliis aside, elevation View of astoker "embodying the. invention rFig; 2 is a plan View. thereqfiparts.being broken] away; .Flg, .3,.1s at. front end.

view of. the furnaceyFigj. 4c, is a; section taken o the, linemen-.4;of, Fig-L 21;. Fig; 5. is a secontaken o11.the.line..5;..5 of Fi 4;; Eigi6 isza detail view f e d. slide,

The furnace fram nclud s. f ont 1- 111111138, rear columns. 9,, inclinedsidememvhers. 1 0; mountecl o rtl lo ie-fiolillimspangl conhas metal.blocks plosed 0.11 inclined Support t facilitate showing modi ied. for

nectedat their lower ends to a bottom frame 7 member 11.

1 air to passfrom the pit into the space above the grates, the passage[of air acting 'to 'cojol the bIOCks. The bottom frame memher '11 18removabl y; mounted t11ereo11- The furnace shown is constructed gwithgrates between the. outer, and middle @101- umns-B. 1, Each gratecomprises. ailplurality of movable-grate sections 19 and each gratesection is made of a. plurality of} grateunits 20.; The. units ZOfi'ming .a;grate section are secured tQgQther in any suitable manner,asby lugs 21' insertablebetween spacedprojections 22= p pp t n grate barthe. lugs of adjacent units abutting each other and, having a suitablefit. between. the

lugs 21 on thebar 23. This feature ne'rmits of ready renewal of thosepartsjofthe grate to replace the Whole grate section The upper grateunit' 24 of? eachjs'ection is pref crab-l of stepped formation, havingair holes 25"thereifn, ancl th'eiother' units of the section are offarcheclf formation having air holes 26 therein the size or number ofthBSe holes 26 inoreasinglfrom thati ofithef pre- .o fiwhioh ride.onflthe-flangesl of, rollers 30. and the Web. portions 31 of. which:aredi's- This construction permits. each grate section tomove up aiid,downinen inclined position,,, the. connection between: thev bars andtherollers keepingthe, grate sections in,

alinement.

Adjacent. gratesectionsare preferably The, columns 8 are connectedtogether by'a front plate 12' antlf doors l3 hinged tothe end columnsprovide access tofthe space beneath the grates.

posedlbetween saidflangesr The. rollers 30 are loosely mounted onupperandflower; shafts, .32 ,"securedfto the; sidefralnes 1.0.

ver 34 on a rock shaft 35, and the other sections are each connected bya link 36 to the other arm of said lever. A crank arm 87 is secured tothe shaft and connected to a piston rod 38 carried by a piston in asteam cylinder 89 which constitutes a motor. The piston and steamcylinder and details are not shown in full, as they are such as arecommonly employed on steam pumps.

A stepped movable feed slide 40 forms the bottom of a feed hopper 41 foreach grate and is preferably secured to alternate grate sections bybolts 42 so as to move there with and opposite to the movement of theother grate sections. Instead of making one slide serve for each grate,stepped feed slides 40 may be connected to each grate section and movetherewith, as shown in Fig. 6. The wall of the hopper adjacent the firebrick arch 43 is formed by plates 44 and 45 spaced apart to form an airspace 45 between them to keep the outer plate 45 cool. These plates aresecured together by providing spaced wedge lugs 46 on the plate 44passing through openings 47 in the plate 45 with wedge blocks 46"between the lugs 46, the plate 45 having spacing lugs 48.

In order that the coal may be prevented from packing in the hopper andthereby interfering with its proper feed, an agitating mechanism isprovided comprising an endless conveyor or impeller 49 formed of spacedrods 50 and chains 51, the latter being mounted on rollers 52 and drivesprockets 53. The shaft 53' carrying the sprockets 53 projects outsideof the hopper and car ries a ratchet wheel 54 engaged by a springpressed pawl 55 on a lever 56 rocked by the crank arm 37 through a link57 The rocking of this lever 56 causes the pawl and ratchet mechanismassociated therewith to give the shaft 53 an intermittent rotarymovement so that the conveyor is given a step-by-step movement in adirection toward the interior of the furnace. This movement of theconveyor keeps the coal from packing and cooperates with the slide 40 infeeding the fuel to the grates.

A discharge opening 58 is provided be tween each slide 40 and the plate45. With the machine in operation the coal is moved on each grate by theconveyor 49 and the slide 40 through the opening 58, the slide 40 movingdownwardly with alternate grate sections as the other sections moveupwardly, and this action serves to advance the fuel along the grates,the fresh-er fuel pushing the partially consumed fuel ahead of it. Bythe time a charge of fuel has reached the lower end of the grate it hasbeen consumed and is dumped into the ashpit by means of dumping grates59 and 60. The grate 59 is ivotally mounted at its rear end at 61 andtips upwardly to prevent fuel on the main grates from passing to the pitwhen the clinker or ash is discharged be tween this grate and the grate60. It is tipped by means of a crank arm 62, l1nk 63 and lever 64 whichengages a pin 65 with the grate is in its normal position and is movedto dotted line position by a pipe or other suitable device. The grate 1spivotally mounted at its rear end at and connected to a toggle link 64,sald link being connected to a toggle link pivoted on the frame. A link66 connectsthe links 64 and 65' with a lever 67 which in its normalposition engages a stop 67. Then the lever 67 is thrown rearward thepivots of the toggle move out of line and the grate 60 moves to thedotted line pos1- tion shown in Fig. 4.

The columns 8 are made hollow and have inlets 68 in their lower endscommunicating with blast air conduits 69 and outlets 70 at their upperends communicating with an airboX 71 extending from the front plate 12to a fixed frame member 7 2 upon which lower end of the grate sectionsslide, the plate 7 3 forming the bottom of the box being removable fromthe front of the furnace so as to prevent fine ashes from the gratescollecting therein and for changing from forced to natural draft.

It is quite important to maintain the air pressure sufficient for propercombustion and in order that this pressure may be indicated an airpressure age 74 is mounted on the front plate and is provided with atube 75, the inner end ofwhich extends into the region below the grateswhere combustion is taking place.

As the adjacent grate sections of each grate move in oppositedirect-ions, the fuel on the grate sections is kept in a state of motionby this action, as well as by the incoming fuel pushing the older fuelahead of it 'down the grate sect-ions.

The design of the air ports or holes 26 in the grate units may be ofdifierent shapes, as indicated in Fig. 2, where only the units of onegrate section are shown in detail. The edges of the grate unitsare'preferably provided. with notches or recesses 76 forming air holes.

. I desire it to be understood that this invention is not to be limitedto any specific form or arrangement of parts except in so far as suchlimitations are'specified in the claims.

What I claim as my invention is:

1. In a furnace, the combination of a hopper having a reciprocatingbottom feed slide and a discharge opening adjacent thereto, a pluralityof inclined reciprocable grate sections having their upper ends adjacent said discharge opening and connected to said feed slide to movetherewith, an endless impeller disposed in said hopper with its lowerrun adjacent said feed Slide, and

means for imparting a step by step movement to the lower run of said,impeller toward said discharge opening and in syning a duct for blastair disposed beneath said sections and PIOVlClQCl' with aninclinedbottom closure plate ext-ending substantially the length of saidsections and removable from the front of the furnace.

3. In a furnace, the combination, with in-;. clined supporting means, ofa grate section comprising a grate supporting bar mov able on an inclineon said supporting means, and a plurality of grate units detachablysecured to said bar, the upper unit being of stepped formation and theother units being of longitudinally arched formation.

4. In a furnace, the combination of a hopper having a reciprocatingbottom feed slide and a discharge opening adjacent thereto, a pluralityof movable grate sections disposed and movable on an incline, means formoving adjacent grate sections in opposite direct-ions, said feed slidebeing connected to alternate grate sections to move therewith, anendless impeller disposed in said hopper with its lower run adjacentsaid feed slide, and means for imparting a step by-step movement to thelower run of said impeller in the direction of said delivery opening.

In testimony whereof, I aflix my signa-' ture.

